src: Substitute __FUNCTION__ with __func__

The former is not standard C, and we primarily use the latter form.

Change-Id: Ia7091b494ff72588fb6910710fd72165693c1ac5
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42516
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Christian Walter <christian.walter@9elements.com>

src/commonlib/include/commonlib/stdlib.h

@@ -29,7 +29,7 @@ static inline void *xmalloc_work(size_t size, const char *file,
 	}
 	return ret;
 }
-#define xmalloc(size) xmalloc_work((size), __FILE__, __FUNCTION__, __LINE__)
+#define xmalloc(size) xmalloc_work((size), __FILE__, __func__, __LINE__)
 
 static inline void *xzalloc_work(size_t size, const char *file,
 				 const char *func, int line)
@@ -38,7 +38,7 @@ static inline void *xzalloc_work(size_t size, const char *file,
 	memset(ret, 0, size);
 	return ret;
 }
-#define xzalloc(size) xzalloc_work((size), __FILE__, __FUNCTION__, __LINE__)
+#define xzalloc(size) xzalloc_work((size), __FILE__, __func__, __LINE__)
 
 void *dma_malloc(size_t size);
 int dma_coherent(void *ptr);